초록 ▼

A new family of ceramic materials is identified having particular utility as thermal insulating or thermal barrier coatings on metallic substrates. The ceramic materials have a pyrochlore structure and are typified by the composition A.sub.2 B.sub.2 O.sub.7 where A and B are various ions and 0 is ox

A new family of ceramic materials is identified having particular utility as thermal insulating or thermal barrier coatings on metallic substrates. The ceramic materials have a pyrochlore structure and are typified by the composition A.sub.2 B.sub.2 O.sub.7 where A and B are various ions and 0 is oxygen. A may have a positive charge of 3.sup.+ or 2.sup.+ and B may have a positive charge of 4.sup.+ or 5.sup.+. These materials are characterized by having chemical stability, thermal stability and thermal insulating properties superior to those of currently used thermal barrier ceramics. An example pyrochlore material is lanthanum zirconate.

대표청구항 ▼

[ I claim:] [1.]1. In a superalloy gas turbine component which operates in an environment with gas temperatures in excess of 1,000.degree. C., said component having internal cooling passages, the improvement which comprises a coating of a ceramic having a pyrochlore crystal structure, said coating b

[ I claim:] [1.]1. In a superalloy gas turbine component which operates in an environment with gas temperatures in excess of 1,000.degree. C., said component having internal cooling passages, the improvement which comprises a coating of a ceramic having a pyrochlore crystal structure, said coating being located to reduce heat flow into said component.